瑞利数

发现扰动的线性阶段成长率是相对瑞利数r的函数。

It is found that the growth rate of perturbation in linear stage is function of relative Rayleigh number r.

在对局部和平均换热系数分析的基础上，整理了瑞利数Ra.L和高宽比H/L对平均换热系数的影响。

According to the curves of local and average heat transfer coefficients , the effect of Rayleigh number and aspect ratio was studied .

根据计算结果着重讨论了流体瑞利数Ra，介质达西数Da以及腔体冷热端温差△T的变化对其传热传质特性的影响，得出一些有用的可指导工程实践的结论。

According to concerned analysis based on the calculated result , the effects on the heat and mass transfer characteristics caused by the change of the Raleigh number , the Darcy number , the temperature deference between the hot and the cold wall of the enclosure is emphatically discussed .

实验结果表明：腔体内的流动随瑞利数Ra的增大而增强，多孔介质参数及多孔介质不同的分布对腔体内的流场有直接的影响。

Through this experiment , it is obviously showed that the flow in the body cavity became more intensified as Rayleigh number increased . And the porous media parameters such as porosity and the placement of the porous media thin layer had a direct effect on the velocity distribution .

对比了不同边界模型、深度和瑞利数时的环型场的变化特征。

The features of toroidal field are studied for different boundary conditions , Rayleigh numbers and depths .

特别的，在低瑞利数下增强效果不明显；在高瑞利数下，腔体内自然对流换热增强较显著。

Specially it is not obvious under lower Rayleigh number effect , and under high Ra number , the natural convection heat transfer in the enclosure is stronger .

瑞利数的大小对自由热对流的格局和速率产生了重要的影响，控制着对流层中高温热柱区和低温冷柱区的相对大小。

It is found that Rayleigh number has great effects on the patterns and velocities of thermal free convection and controls the relative ratio of hot and cold plume in the shell .

具体分析了瑞利数变化范围为104到106时建筑围护结构传热对室内自然对流的影响.数值预测结果表明：该方法能够真实反映室内自然对流问题。

Results are presented for Rayleigh number in the range of 10 4 to 10 6.The computation result and predictor test show that this procedure can fully reflect conjugate conduction with natural convection in enclosure .